Multiple Choice
Which plant hormone is primarily responsible for promoting cell elongation and growth in response to environmental stimuli?
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37. Plant Sensation and Response
Plant Defenses
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Which two processes must work together to move water from the roots to the top of tall plants?
A
Active transport and phloem loading
B
Photosynthesis and respiration
C
Osmosis and phototropism
D
Transpiration and cohesion-tension
Verified step by step guidance1
Understand the problem: The question asks which processes are responsible for moving water from the roots to the top of tall plants. This involves understanding plant physiology, specifically water transport mechanisms.
Recall the cohesion-tension theory: Water is pulled upward in plants due to the combination of transpiration (water evaporation from leaves) and cohesion (water molecules sticking together due to hydrogen bonding).
Explain transpiration: Transpiration occurs when water evaporates from the stomata in the leaves. This creates a negative pressure (tension) in the xylem, pulling water upward from the roots.
Explain cohesion: Water molecules are cohesive due to hydrogen bonding. This property allows water to form a continuous column in the xylem, enabling it to be pulled upward without breaking.
Combine the processes: Transpiration generates the pulling force, while cohesion ensures the water column remains intact. Together, these processes enable water to move from the roots to the top of tall plants.
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